Progress Telerik UI for ASP.NET AJAX
Users can add comments to any cell – whether it’s a note to themselves or a collaborator, or perhaps an explanation of what a formula does.
The Spreadsheet component has built-in support for importing from Excel and exporting to both PDF and Excel (.xlsx) files. This makes interoperability a breeze and users can switch between using their favorite external spreadsheet editor and the Spreadsheet component in the application.
All standard image formats can be imported and added to cells as content. This makes visualizing complex tables more intuitive as users can place images to provide clues about what each cell does, or just to improve the table’s visualization.